39061981381 has 2 divisors, whose sum is σ = 39061981382. Its totient is φ = 39061981380.

The previous prime is 39061981339. The next prime is 39061981471. The reversal of 39061981381 is 18318916093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37779696900 + 1282284481 = 194370^2 + 35809^2 .

It is an emirp because it is prime and its reverse (18318916093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39061981381 - 2¹⁵ = 39061948613 is a prime.

It is a super-2 number, since 2×39061981381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39061981481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19530990690 + 19530990691.

It is an arithmetic number, because the mean of its divisors is an integer number (19530990691).

Almost surely, 2^39061981381 is an apocalyptic number.

It is an amenable number.

39061981381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39061981381 is an equidigital number, since it uses as much as digits as its factorization.

39061981381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 39061981381 in words is "thirty-nine billion, sixty-one million, nine hundred eighty-one thousand, three hundred eighty-one".